<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Blur background example</title>
    <style>
      body {
        margin: 0;
        background: url("tile.png");
        font-family: Arial, Helvetica, sans-serif;
      }

      button {
        margin: 5px 0 0 5px;
      }

      :popover-open {
        width: 300px;
        height: 200px;
        padding: 0 10px;
        border-radius: 10px;
      }

      p {
        line-height: 1.5;
      }

      ::backdrop {
        backdrop-filter: blur(3px);
      }
    </style>
  </head>
  <body>
    <button popovertarget="mypopover" popovertargetaction="show">
      Show popover
    </button>
    <div id="mypopover" popover>
      <h2>Popover heading</h2>
      <p>
        This here is some very important content that we want to draw your
        attention to before you light dismiss it. Read it all, do not delay!
      </p>
    </div>
  </body>
</html>
